Levothyroxine
Generic name: Levothyroxine | Common brands: Synthroid, Euthyrox, Eltroxin
What is Levothyroxine?
Levothyroxine is synthetic T4 used to replace thyroid hormone in hypothyroidism or to suppress TSH after thyroid cancer treatment.
How to take
- Take on an empty stomach with water, 30–60 minutes before breakfast; avoid coffee, calcium/iron within 4 hours.
- Stay with the same brand/formulation when possible to reduce variability.
Monitoring
- Recheck thyroid panel (TSH ± FT4) 6–8 weeks after any dose change, then every 6–12 months.
- Pregnancy: closer monitoring each trimester; doses often need 20–30% increase early in pregnancy.
Common issues
- Under-replacement: fatigue, weight gain, cold intolerance, constipation, high LDL.
- Over-replacement: palpitations, anxiety, bone loss risk; TSH suppressed.
Drug/food interactions
- Iron, calcium, PPIs, soy, high-fiber supplements, bile-acid sequestrants reduce absorption—separate by 4 hours.
- Amiodarone, lithium, antiepileptics may alter requirements.
Medical Disclaimer: Education only; follow your clinician’s advice.
🧪 Key Lab Tests to Monitor
Doctors often track these specific indicators to ensure Levothyroxine is working safely and effectively:
Taking Levothyroxine?
Upload your blood test results. WellAlly will automatically plot your thyroid-panel trends alongside your medication timeline.
⚠️ Medical Disclaimer
The information provided here is for educational purposes only and is not intended as medical advice. Always consult with your healthcare provider regarding your medications and lab results. Do not stop taking any medication without talking to your doctor.